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We observe a hysteretic reorientation of the magnetic vortex lattice in thenoncentrosymmetric superconductor Ru7B3, with the change in orientation drivenby altering magnetic field below Tc. Normally a vortex lattice chooses either asingle or degenerate set of orientations with respect to a crystal lattice atany given field or temperature, a behavior well described by prevailingphenomenological and microscopic theories. Here, in the absence of any typicalVL structural transition, we observe a continuous rotation of the vortexlattice which exhibits a pronounced hysteresis and is driven by a change inmagnetic field. We propose that this rotation is related to the spontaneousmagnetic fields present in the superconducting phase, which are evidenced bythe observation of time-reversal symmetry breaking, and the physics of brokeninversion symmetry. Finally, we develop a model from the Ginzburg-Landauapproach which shows that the coupling of these to the vortex latticeorientation can result in the rotation we observe.

Rotation of the magnetic vortex lattice in Ru7B3 driven by the effects of broken time-reversal and inversion symmetry